Certain octahydro indolizines



United States Patent 3,245,991 CERTAIN .GCTAHYDRO INDOLIZINES Richard Joseph Mohrbacher, Fort Washington, Pa., assignor to McNeil Laboratories, Incorporated, a corporation of Pennsylvania No Drawing. Filed Apr. 2, 1963, .Ser. No. 269,886 9 "Claims. (Cl. .260-247.5)

This invention relates to a new series of organic compounds. More particularly, this invention relates .to certain octahydro-indolizine2 alkanols and their esters, octahydro-indolizine-Z-alkylamines, and acid addition and quaternary ammonium salts thereof, and to methods for their preparation.

. T he compounds of the present inventionmay be represented by the following structural formula:

wherein n is a positive integer from 1 .to 3; R is hydrogen or phenyl; R is hydrogen or benzyl; and R is hydroxy, azacyclo such as pyrrolidino, piperazino and piperidino, oxaazacyclo such as morpholino, and di-aryl hydroxyacetoxy such as diphenylhydroxyacetoxy, wherein when R is hydrogen, R is benzyl and R is hydroxy.

The novel compounds, in tests on animals, have been found to possess hypotensive properties. For example, when a dose of 1 mg./kg. of body weight of octahydro- 1 phenyl 2 (1 pyrrolidinylmethyl)indolizine dihydrochloride is administered to a dog, marked prolonged hypotension is produced. The compounds also cause a decrease in motor activity in experimental animals and are therefore useful as central nervous system depressants. Many of them exhibit antiinflammatory and anticholinergic activity when administered to laboratory animals. The specific type of pharmacological activity of the compounds of the present invention depends to a large extent on the specific chemical constitution and configuration of the compound, i.e., Whether it is an alcohol, ester, quaternary salt, etc., and whether it is phenyl substituted or benzyl substituted.

The new alkanols are useful in the synthesisof other compounds which also have valuable pharmacological properties. Thus, the novel indolizine-Z-alkanols maybe converted to esters by reaction With acylating agents capable of introducing, for example, a diphenylhydroxyacetyl radical. Such esters possess anti-inflammatory and hypotensive properties.

The novel octahydro-indolizine-Z-alkanols are prepared by Knoevenagel condensation of Z-pyridinecarboxaldehyde with a dialkyl malonate. A suitable condensing agent for this reaction is a secondary amine such asdibutylamine or piperidine. Advantageously, one may conduct the reaction in the presence .of a weakorganic acid such as acetic, formic, propionic, butyric .or, preferably, benzoic acid.

The resultant dialkyl 2-pyridylmethylenemalonate may then be reacted in a number of ways -to produce the 1- phenyl substituted and the 2-benzyl substituted octahydro-indolizines of the present invention.

Initially, the ester of oxo-indolizinecarboxylic acid is produced by hydrogenating the dialkyl Z-pyridylmethylenemalonate. The reactionis carried out by treating the malonate with hydrogen catalytically activated'by a platinum, palladium or nickel catalyst such as platinum oxide or Raney nickel. The intermediate piperidino-methylmalonate cyclizers to the octahydroindolizinecarboxylic acid ester which is then reacted with a benzyl halide in the presence of a metal hydride such as sodium hydride to give the 2-benzylindolizine-2-carboxylate which is then reduced to form the alcohols of the present invention. The reduction may be carried out with any one of a variety of well-known reducing agents such as a complex metal hydride, i.e., sodium borohydride, potassium borohydride or, preferably, lithium aluminum hydride in the presence of a solvent. Suitable solvents when a metal borohydride is used are methanol, ethanol, 2-propanol and the like; whereas if the reducing agent is lithium aluminum hydride, suitable solvents are an anhydrous ether, tetrahydrofuran,.ethylene glycol dimethyl ether, and the like.

. Another method of producing the compounds of the present invention is to react .the dialkyl Z-pyridylmethylenemalonate with a Grignard reagent such as a phenylmagnesium halide in an etheral solvent to produce the phenyl substituted malonate which may then be catalytically hydrogenated as previously described to produce the substituted ester of 'l-phenyl-octahydro-oxoindolizinecarboxylic acid. The phenyl substituted ester may be reduced with a complex metal hydride .as .previously described to form the phenyl substituted alcohols of the present invention.

The 2-alkylcycloamine compounds of the present invention are prepared .by saponifying the octahydroeoxoindolizine esters produced as previously described to produce the corresponding Z-carboxylic acids. These are then converted to the acid halides, .the mixed anhydrides or the alkyl esters. Treatment ,of any of these forms with an amine bearing an available hydrogen gives the acid amide which is reduced with .a complex metal hydride to form the octahydroindolizinemethylpyrrolidines and 'morpholines-of the present invention.

Therapeutically useful acid addition salts of the com.- pounds of this invention include those obtainable by reacting the compound .With an appropriate acid .as, for example, an inorganic acid such as hydrochloric, vthio- .cyanic, sulfuric, a phosphoric acid, etc, or an organic acid such as acetic, lactic, oxalic, malonic, fumaric, benzoic, etc.

The novel compounds of the present invention may be converted into the corresponding quaternary ammonium compounds -'by reacting them with alkylating agents such as alkylhalides, e.g., methyl iodide, ethyl bromide, propyl chloride; lower alkenyl halides, e.g,, alkyl bromide; diloweralkylsulfates, e.g., dimethylsulfate; aralkyl halides, e.g., benzyl bromide, benzyl chloride and the like. The reaction is usually performed in a solvent such as an ether, alkanols or the like.

The following examples are intended to illustrate, but notto limit, the scope of the present invention.

Example I Z-pyridinecarboxaldehyde (107 parts by weight), dimethyl malonate parts by weight) piperidine (8 parts by volume) and benzoic acid (6.6 parts by weight) are heated .in benzene for 2.5 hours with azeotropic distillation of water. The reaction solution is cooled, concentrated under reduced pressure, diluted with ether, washed with sodium bicarbonate solution and water and dried. Removal of the solvents underreduced pressure and trituration of the residue with aqueous methanol gives parts by weight of white plates, melting point 82 C. to 84 C. One recrystallization from aqueous methanol gives white plates, dimethyl 2- pyridylmethylenemalonate, melting point 83.5 vC. to 84.5 C.

Example .11

The diethyl homolog is prepared by the same method as dimethyl 2-pyridylemethylenemalonate starting with di- 3 ethyl malonate... The twice distilled orange-brown liquid (81% yield, boiling point 157/0.5 mm.) solidifies on standing. A sample of the free base is converted to the sulfate salt and recrystallized twice from ethanol-ether to give White needles, diethyl 2-pyridylmethylenemalonate sulfate, melting point 100 C. to 101.5 C.

Example 111 To an ethereal solution of phenylmagnesium bromide (prepared from 196 parts by weight of bromobenzene and 30 parts by weight of magnesium) a benzene solution of 125 parts by weight of dimethyl Z-pyridylmethylenemalonate is added dropwise over a period of one and one half hours, at 0 C. to C. The reaction solution is stirred for two hours at 5 C., then poured into cold, dilute hydrochloric acid. The aqueous layer is withdrawn and partially neutralized with solid potassium carbonate. The precipitated solid is filtered and air dried, amounting to 81 parts by weight of a tan solid, melting point 155 C. to 165 C. (dec.). Recrystallization from ethanol-, ether gives a White solid, melting point 175 C. to 178 C. (dec.). This material is dimethyl pheuyl-Z-pyridylmethylmalonate hydrochloride. Neutralization of its aqueous solution affords the corresponding free base, subsequently described. The original filtrate of the hydrochloride salt is made basic with potassium carbonate and extracted with ether, then with methylene chloride. Drying of the organic layers over magnesium sulfate and concentration gives 20 parts by weight of a tan solid, melting point 95 C. to 97 C. Recrysallization from petroleum ether ethyl acetate affords a white .solid, dimethyl phenyl-2- pyridylmethylmalonate, melting point 97 C. to 98 C.

Example IV The procedure used for the preparation of dimethyl phenyl-Z-pyridylmethylmalonate is followed with the following amounts of materials: phenylmagnesium bromide from 70 parts by weight of bromobenzene and 10.7 parts by weight of magnesium and diethyl Z- yridylmethylenemalonate (51 parts by weight). The product, isolated as the free base, amounts, after one recrystallization from petroleum ether, to 35 parts by weight of a white solid, melting point 71.5 C; to 72 C.

Example V A 10.8 parts by weight sample of diethyl 2-pyridylrnethylenemalonate is reduced over 0.8 part by weight of platinum oxide in 100 parts by volume of absolute ethanol and 4 parts by volume of glacial acetic acid under an initial pressure of 60 pounds/in. of hydrogen. After seven hours, the theoretical amount of hydrogen has been consumed and the hydrogen uptake stops. The reaction solution is filtered and concentrated to dryness under reduced pressure using gentle heat. The concentrate, cooled in an ice bath, is made basic with 14 parts by volume of 35% sodium hydroxide and extracted with ether. The ether extracts are combined, washed with water, dried and concentrated to dryness under reduced pressure, giving 8.9 parts by weight of ethyl octahydro-3-oxo-2-indolizinecarboxylate as a yellow oil. After two distillations, 6.2 parts 4 Example V11 To an ethanolic solution of dimethyl phenyl-2-pyridylmethylmalonate (10 parts by weight) containing 10 parts by volume of glacial acetic acid, is added 1 part by weight of platinum oxide catalyst and the mixture is hydrogenated at room temperature at an initial pressure of 51 pounds/in After the theoretical amount of hydrogen has been absorbed (three hours), the reaction mixture is filtered. The filtrate is concentrated, diluted with ether, washed with aqueous sodium bicarbonate, dried and concentrated. Trituration of the oily residue in petroleum ether-ether gives 6.1 parts by weight of the product as a mixture of geometrical isomers. A recrystallization from petroleum ethenethyl acetate gives white crystals of methyl octahydro-3-oxo-1phenyl-2-indolizinecarboxylate, melting point 84 C. to 89 C.

A 0.330 part by weight sampleof sharp-melting octahydr-o-3-oxo-1-phenyl-2-indolizinecarboxylic acid (melting point 166 C. to 167 C.) is dissolved in methanol and treated with diazomethane until the yellow color persists. The solution is then decolorized with a drop of acetic acid and concentrated. The residual semisolid is recrystallized from petroleum ether-ethyl acetate to give by weight of a pale yellow oil is obtained, boiling point Example VI A 22.1 parts by weight sample of dimethyl 2-pyridylmethylenemalonate is reduced over 1.25 parts by weight of platinum oxide catalyst in a solution of 150 parts by volume of ethanol and 10 parts by volume of acetic acid. The initial pressure of hydrogen is 60 pounds/m After the theoretical amount of hydrogen is consumed, the catalyst is removed by filtration and the filtrate is concentrated to an oil which is distilled, giving 14.3 parts by weight of an oil, methyl octahydro-3-oxo-2-indolizinecarboxylate, boiling point 138-145 1 mm.

0.235 part by weight of white prisms, methyl octahydro- 3-oxo-1 phenyl 2 indolizine-carboxylate, melting point 1l3.5 C. to 114 C. The infrared spectrum of this material is very similar but not identical with the spectrum of the above-mentioned mixture of isomers.

Example VIII A solution of 29.6 parts by weight of methyl octahydro- 3-oxo-2-indolizinecarboxylate in 50 parts by volumeof toluene is added dropwise over fifteen minutes to a suspension of sodium hydride (8.3 parts by weight of 54.7% sodium hydride in mineral oil is well washed with toluene to remove the mineral oil; the weight of active sodium hydride is assumed to be 4.5 parts by weight) in 250 parts by volume of toluene. After one hour refluxing, the gas evolution ceases and a solution of 25.3 parts by weight of benzyl chloride in 50 parts by volume of toluene is added dropwise to the stirred mixture at C. The mixture is stirred at reflux for sixteen hours, cooled and carefully treated with 5 parts by volume of absolute ethanol, then 100 parts by volume of water. The organic layer is washed successively with 10% sodium hydroxide solution, water and dilute hydrochloric acid. The aqueous acidic layer, along with some additional concentrated hydrochloric acid, is added to the combined aqueous and basic solutions until the resulting pH is approximately 3. A solid, octahydro- 3-oxo-2-benzyl-2-indolizinecarboxylic acid, separates, is collected by filtration, dried and found to weigh 6.3 parts by weight (15% of the theoretical amount of octahydro- 3-oxo-2-benzyl-Z-indolizinecarboxylie acid), melting point 170 C. (gas evolution). The organic layer from the acid extraction is washed with water and dried by azeotropic distillation, which is continued to remove all volatile material. The residual oil weighs 35.8 parts by weight. A sample of the oil, methyl octahydro-3-oxo-2- benzyl-2-indolizinecarboxylate, is distilled, boiling point /0.2 mm.

Example IX To an aqueousmethanolic solution of methyl octahydro-3-oxo-1-phenyl-2-indolizinecarboxylate (35 parts by weight) is added 5 parts by weight of sodium hydroxide and the resulting solution is refluxed for three hours. It is then concentrated, diluted with water and extracted with ether. The aqueous layer is made acidic with concentrated hydrochloric acid and extracted with methylene chloride. After'drying, the solvent is removed under reduced pressure leaving 29.3 parts by weight of the crystalline product. A recrystallization from ethyl acetate gives the pure product as a mixture of geometrical Example X lizations from the same solvent mixture give a small yield.

of crystals, octahydro-3-oxo-2-indolizinecarboxylic acid, melting sharply at 123 C. to l24.5 C.

Example XI A mixture of 23 parts by weight ofmethyl octahydro- 3-oxo2-benzyl-2-indolizinecarboxylate, 40 parts by volume of 95% ethanol and 50 parts by volume of aqueous sodium. hydroxide is refluxed for five hours. A cloudiness is removed by filtration and the filtrate is concentrated under reduced pressure almost to dryness. The slurry is dissolved in 125 parts by volume of Water, the solution is extracted with ether, and the cooled aqueous layer is made strongly acidic withv concentrated hydrochloric acid. The cream. colored solid which is collected by filtration is thoroughly dried over phosphorouspentoxide to give 16.9 parts byweight, melting point 175 C. (gas evolution) of octahydro-3-oxo-2-benzyl-Z-indolizinecarboxylic acid. A sample is recrystallized twice from ethyl acetate and is found tomelt at- 177 C. (gas evolution).

Example XII Methyl octahydro-3-oxo-1phenyl 2-indolizinecarboxylate (10.6 parts by weight) isreduced with 6.9 parts by weight of lithium aluminum hydride by the procedure described in Example XII-I. A.4.7. parts by weight sample of the resulting yellow oil (total yield 8.5 parts by weight) is treated with 1.2 parts by weight of fumaric acid in methanol. The resulting solid is recrystallized severaltimes from isopropyl alcohol-ether to give a white solid, octahydrol-phenyl-2-indolizinemethanol fumarate, melting point 173 C. to 175 C. (dec.)'.

Example XIII To an ether suspension of lithium aluminum hydride (812 parts by weight) is added an ethereal solution of ethyl octahydro 3-oxo-l-phenyl-2-indo1izinecarboxylate, 13.2 parts by weight, over a period of one-half hour. The mixture is refluxed for three and one-half hours, cooled and 24.5 parts by volume of water added cautiously. The solids are removed by filtration and the filtrate, after drying overmagnesium sulfate, is concentrated to leave 85' parts by' weight of a slightly yellow oil. An ether solution of this oil is allowed to react for fifty hours with methyl iodide (5 parts by weight). The precipitated solid amounts to 7.3 parts by weight. It is recrystallized repeatedly from ethanol to afiordtwofractions. Fraction (a) amounts to 4.1 parts by weight of a mixture of isomers of octahydro-l-phenyl-Z-indolizinemethanol methiodide, melting point 218.5 C. to 219.5 C.

Fraction (b) amounts to 0.8 part by weight of a single isomer of octahydro-1-phenyl-2-indolizinemethanol methiodide, melting point 184 C. to 186 C., whose infrared spectrum is similar to that of fraction (a).

Example XIV A solution of 14.4parts by Weight of methyl octahydro- 3-oxo-2-benzyl 2-indolizinecarboxylate in 50 parts by volume of ether is added dropwise to a suspension of 5.7 parts by weight of lithium aluminum. hydride in 200 parts by volume of ether. The stirred mixture is refluxed overnight, then cooled and decomposed by the careful addition of 17' parts by volume of water. The inorganic solids are removed by filtration and the organic solution.

is washed with water, dried and evaporated under reduced pressure to give 9.4 parts by weight (77% of theory) of oil. A sample of the oil: is converted to its hydrochloride salt which is recrystallized twice from 2- propanol to give white platelets, 0ctahydro-2-benzyl-2- indolizinemethan-olhydrochloride, melting point 235 C. to 237 C.

Example XV To 0.2 part by weight of dry sodium met-hoxide and 6.8 parts by weight of octahydro-Z-indolizihemethanol suspended in 700 parts by volume of n-heptane is added 10.6 parts by weight of ethyl benzil'ate. The mixture is refluxed for one hour and then 475' parts by volume of liquid is removed by distillation. Ether, 150 parts by volume, is added to the remaining residue and the resulting solution is extracted with dilute hydrochloric acid. Basification or" the aqueous acid layer, extraction with ether, and evaporation of the ether layer to dryness gives 9.6 parts by weight of solid, melting point 98 C. to 102. C. Two recrystallizations from heptane give 6.8 parts by weight of crystals, octahydro-2-indolizinemethy1benzilate, melting point 104 C. to 106 C- Example X VI The procedure for the. preparation of octahydro-Z- indolizinemethyl' benzilate is employed with 9 parts by weight of octahydro-1'-phenyl-2-indolizinemethanol and Example XVII A 7.2' parts by weight sample of octahydro-3-oxo-2- indolizinecarboxylic acid and 1.6 parts by Weight of sodium hydroxide in 50 parts by volume of water-ethanol solution (3:2) is evaporated to a. gum and driedv under high vacuumat 60 C. A benzene solution of fl-dimethylaminoethyl chloride (from. trituration of 9.2 parts by weight of the hydrochloride salt with sodium hydroxide pellets) is added to the dry sodium carboxylate suspended in 50 parts by volume of benzene. The, mixture is refluxed for twenty-four hours, cooled and 1.7 parts by weight of sodium chloride removed by filtration. The. filtrate is evaporated to give. 8.8 parts byweight of oil which is distilled. The light yellow oily distillate. (7.3 parts by Weight) boils at 155/0.35 mm. The oily base is converted to the fumarate salt and recrystallized successively from 2-propanol ether and ethanol-ether to give white crystals of 2-dimethylaminoethyl' octahydro-3-oxo- 2-indolizinecarb'oxylate fumarate, melting point 113 C. to 115 C.

Example XVIII Sodium octahydro-3-oxo-I plienyl-2 indolizinecarboxylate, prepared from 6.8 parts by weight of the corresponding acid (octahydro-3 oxo-ll-phenyI-Zindblizinecarboxyli'c acid) and 1.05 parts by weight of sodium hydroxide, is suspended in. dry benzene and a benzene solution of dimethylaminoethyl chloride (from. 7.5 partsby Weight of the corresponding hydrochloride and 3.5 parts by weight of solid sodium hydroxide) isadded to the mixture, which is refluxed for twenty-five hours, then allowed to stir at room temperature for several days. The reaction mixture is filtered, the filtrate is extracted with dilute hydrochloric acid, the aqueous layer made. basic: with solid potassium carbonate and extracted. with methylene chloride. After drying, the solvent is removed leaving, 6.1 parts by weight of a brown oil. The compound is then boiled in methanol, with fumaric acid, for three hours, concentrated 7 and the residue crystallized from isopropyl alcohol-ether giving 1.65 parts by weight of a white solid, Z-dimethylamino-ethyl octahydro-3-oxo-1-phenyl-2-indolizinecarboxylate fumarate, melting point 150 C. to 160 C. Several recrystallizations from isopropyl alcohol-ether raises the melting point to 161 C. to 163 C.

Example XIX To a benzene solution of octahydro-3-oxo-l-phenyl-Z- indolizinecarboxylic acid chloride, prepared from 6.5 parts by weight of the sodium salt of the corresponding acid and 2.9 parts by weight of oxalyl chloride according to the procedure of G. I. Poos et a1. [J. Org. Chem., 26, 4898 (1961)] is added dropwise a solution of 1-methyl-4- hydroxypiperidine (3 parts by weight) in benzene. The resulting mixture is stirred at room temperature for one hour then poured into cold dilute hydrochloric acid and washed with ether. The acidic layer is made basic with potassium carbonate and extracted with ether. The ether solution is dried and concentrated. The residual oil forms a fumarate salt which after three recrystallizations from ethanolether gives a white solid (1-methyl-4-piperidyl), octahydro-3-oxo-1-phenyl-2-indolizinecarboxylate fumarate, melting point 174 C. to 176 C.

Example XX A 16.8 parts by Weight sample of ethyl octahydro-3 oxo-2-indolizinecarboxylate is added to a solution of 1.08 parts by weight of sodium methoxide in 165 parts by volume of methanol. A 14.6 parts by weight sample of 4- phenylpiperazine is then 'added and the solution is refluxed for twenty-eight hours. After addition of 0.5 part by volume of water, the solvents are removed by evaporation under reduced pressure to give a white solid. Recrystallization from benzene-petroleum ether (30 C. to 60 C.) gives 15.5 parts by weight of a white solid, octahydro-3-oxo-2-(4-phenyl 1 piperazinylcarbonyl)indolizine, melting .point 153 C. to 157 C. One recrystallization from ethyl acetate (Norite gives white nacreous plates, melting point 162 C. to 164 C.

Example XXI A 16.8 parts by weight sample of ethyl octahydro-3-oxo- 2-indolizinecarb oxylate is added to a solution of 1.08 parts by weight of sodium methoxide in 40 parts by volume of methanol. A 14.0 parts by weight sample of freshly distilled p-dimethyla-minoethylarnine is then added and the solution is refluxed for two hours. After sitting overnight, 0.5 part by volume of water is added and the solvents removed by evaporation under reduced pressure to give an oil which is distilled. The fraction boiling at 174/0.35 mm., octahydro-3-oxo-2- [N-(2 dimethylaminoethyl) carbamoyl]indolizine, Weighs 9.5 parts by weight. The oily base is converted to its hydrochloride salt and the salt, after two recrystallizations from 2-propanol-ether solution, gives white nacreous plates, melting point 174 C. to 176 C.

Example XXII To a solution of sodium methoxide prepared from 0.57 part by weight of sodium in 50 parts by volume of methanol is added a solution of methyl octahydro-3-oxo- 2-indolizinecarboxylate (19.7 parts by weight) in 50 parts by volume of methanol followed by the addition of damphetamine (15.0 parts by weight) in 50 parts by volume of methanol. The solution is refluxed for twenty hours, then the methanol is removed under reduced pressure. The oil is distilled twice to give octahydro- 3-oxo-2-[N (a methylphenethyl)carbamoyl]indolizine, boiling point 185192/0.075 mm.

Example XXIII A benzene solution of octahydro-3-oxo-2-indolizinecarboxylic acid chloride is prepared from 8.1 parts by weight of the corresponding acid (octahydro-3-oxo-2- indolizinecarboxylic acid) via the anhydrous sodium salt and 5.6 parts by weight of oxalyl chloride according to the procedure of G. I. Poos et al. [J. Org. Chem, 26, 4898 (1961)]. To this solution is added dropwise over twenty-five minutes a solution of 5.2 parts by weight of 3-aminomethylpyridine. A solid begins to separate; 5 parts by volume of triethylamine is added. The mixture is stirred overnight at room temperature then filtered from 8.4 parts by weight of insoluble salts. The filtrate is washed with water, dried and evaporated under reduced pressure to give 2.4 parts by weight of oil. The aqueous washings are combined and made basic (pH 14) with 35% sodium hydroxide solution. The mixture is extracted with benzene and the organic layer is dried and evaporated under reduced pressure to give 7.8 parts by weight of oil. The. combine oils are chromatographed on a column packed with neutral Woelm alumina. The column is eluted with benzene, ether, and etherethanol. The fraction collected from the ether-ethanol (1:1) eluate is evaporated to give 7.6 parts by weight of semisolid which is recrystallized from ether to give 5.5 parts by weight of white crystals, octahydro-3-oxo-2-[N-(3- pyridylmethyl)carbamoyl]indolizine, melting point 114 C. to 117 C. Successive recrystallizations from ethyl acetate-hexane and ethyl acetate-ether give white crystals, melting point C. to 1l6.5 C.

Example XXIV To a benzene solution of octahydro-3-oxo-1-phenyl- 2-indolizinecarboxylic acid chloride, prepared from 8 parts by weight of the sodium salt of the corresponding acid and 3.58 parts by weight of oxalyl chloride is added dropwise a solution of pyrrolidine (3.98 parts by weight) in benzene. The resulting reaction solution is stirred at room temperature for two hours, washed with dilute hydrochloric acid, dried and concentrated. The residual yellow solid is recrystallized from ethyl acetate to give 6.6 parts by weight of white needles, octahydro-3-oxo-lphenyl 2-(1 pyrrolidinylcarbonyl)indolizine, melting point 169 C. to 170 C.

Example XXV The procedure described for the preparation of octahydro-3-oxo-1-phenyl 2 l-pyrrolidinylcarbonyl)indolizine is employed with 5.1 parts by weight of sodium octahydro-3-oxo-1-phenyl-2-indolizinecarboxylate, 2.57 parts by weight of oxalyl chloride and 5 parts by weight of lphenylpiperazine. The crude product which amounts to 5.4 parts by weight is recrystallized from ethyl acetate ,to give a white solid, octahydro-3-oxo-1-phenyl-2-(4- phenyl 1 piperazinylcarbonyl)indolizine, melting point 164 C. to C.

Example XXVI The procedure described for the preparation of octahydro-3-oxo-l-phenyl-2-(1 pyrrolidinylcarbonyl)indolizine is employed with 14 parts by weight of sodium octahydro-B-oxo-l-phenyl 2 indolizinecarboxylate, 6.3 parts by weight of oxalyl chloride and 9 parts by weight of morpholine. The crude product, which amounts to 15.2 parts by weight, is recrystallized twice from ethyl acetate to give small white prisms, octahydro-3-oxo-l-phenyl-Z- morpholinocarbonylindolizine, melting point 128 C. to 129 C.

Example XXVII The procedure described for the preparation of octahydro 3 oX-o 1 phenyl-2-(l-pyrrolidinylcarbonyl)indolizine is employed with 6.6 parts by weight of sodium octahydro 3 oxo 1-phenyl-2-indolizinecarboxylate, 2.9 parts by weight of oxalyl chloride and 3.2 parts by weight of l-piperazineethanol. The crude product is refluxed in 5% aqueous methanolic sodium hydroxide for fifteen minutes to remove, by hydrolysis, the amino ester which forms as a by-product. The base insoluble portion amounts to 2.2 parts by weight which on recrystallization from ethyl acetate gives white crystals, octahydro-3-oxo- 1-phenyl-2-[4-(2-hydroxymethyl) -1-piperazinylcarbonyl] indolizine, melting point 179 C. to 180 C.

Example XX VIII A benzene solution of 6.6 parts by weight of octahydro 3-oxo-1-phenyl-2-( l-pyrrolidinylcarbonyl)indolizine is added dropwise to a stirred lithium aluminum hydride suspension (4.1 parts by weight) in ether and the resulting mixture is refluxed for three hours. The mixture is then decomposed with 12 parts by volume of water, filtered, and the filtrate, after drying, concentrated. Saturation of an ethereal solution of the oily residue with dry hydrogen chloride gives a hygroscopic solid. After several recrystallizations from ethanol-ether, crystals of the dihydrochloride, octahydro 1 phenyl 2-(1-pyrrolidinylmethyDindolizine dihydrochloride, melting point 245.5 C. to 247 C., are obtained.

Example XXIX The procedure described for the preparation of octahydro-1-phenyl-2-( 1-pyrrolidinylrnethyl)indolizine dihydrochloride is employed with 1.8 parts by weight of octahydro 3 oxo-1-phenyl-2-morpholinocarbonylindolizine and 1.2 parts by weight of lithium aluminum hydride in ether. The product is isolated as the dihydrochloride salt, octahydro-l-phenyl-2-morpholinomethylindolizine dihydrochloride, melting point 270 C. to 272 C. (dec.).

Example XXX A 70.6 parts by weight sample of octahydro-3-oxo-2- benzyl-2-indolizinecarboxylic acid in an Erlenmeyer flask is heated on the hot plate until it melts and then for an additional ten minutes until no more gas is evolved. The oil is dissolved in ether-benzene and extracted with sodium bicarbonate solution. The organic solution is washed with water, dried and evaporated under reduced pressure to an oil, 49.5 parts by weight. A sample of the oil is distilled twice to give a pale yellow oil, octahydro-3-oxo-2- 'benzylindolizine, boiling at 138/0.175 mm.

Example XXXI A solution of 15 parts by weight of octahydro-3-oxo- 2-benzylindolizine in 75 parts by volume of ether is added dropwise over fifteen minutes to a suspension of 7.4 parts by weight of lithium aluminum hydride in 150 parts by volume of ether. The stirred mixture is refluxed overnight, then cooled and decomposed by the careful addition of 23 parts by volume of water. The inorganic solids are removed by filtration and the organic solution is washed with water, dried and concentrated to dryness under reduced pressure to give 14 parts by weight of oil. This oil upon sitting at room temperature for six days in a stoppered flask deposits a viscous brown oil whose infrared spectrum suggests a carbonate salt has formed. The pale yellow-tan supernatant is distilled to give 9.7 parts by weight of colorless oil boiling at 97100/0.15 mm. A sample of the oily base is converted to the hexamate salt which is recrystallized from acetone-ether solution to give white crystals, octahydro- 2-benzylindolizine hexamate, melting point 108 C. to 120 C.

Example XXXII A 4.5 parts by weight sample of octahydro-3-oxo-2- 'benzyl-2-indolizinecarboxylic acid is added portionwise over twenty minutes to 66 parts by weight of polyphosphoric acid heated to 100 C. After three hours heating and stirring at 100 C. the slurry is cooled and poured onto crushed ice. After the ice melts, the aqueous solution is extracted several times with ether-benzene and the combined organic layer is washed with water, dried, and evaporated under reduced pressure to 4 parts by weight of oil which crystallizes, melting point 113 C. to 117 C. One recrystallization from cyclohexane gives 2.8 parts by weight of crystals, melting point 119 C. to 121 C. A sample, 1',5,6',7',8,8a'-hexahydro-l-oxospiro(indan- 10 2,2-ind0lizi'n)-3(2H)-one, is recrystallized to constant melting point, 121 C. to 122 C.

Example XXXIII A suspension of 7.7 parts by weight of 1,5',6,7,8, 8a'-hexahydro-1-oxospiro(indan 2,2 indolizin)-3(2'H)- one in 600 parts by volume of ether is added rapidly to a suspension of 3.4 parts by weight of lithium aluminum hydride in 300 parts by volume of ether with cooling. The mixture is stirred at reflux for twenty hours, cooled, and cautiously treated with 10.4 parts by volume of water. After removal of the inorganic solids by filtration the filtrate is extracted with 10% sodium hydroxide solution, washed with water, dried, and evaporated to 5.6 parts by weight of oil which crystallizes, melting point 107 C. to 117 C. Two recrystallizations from benzene-hexane give 3 parts by weight of white crystals, octahydro-l-hydroxyspiro(indan-2,2-indolizine), melting point C. to 122 C.

' Example XXXIV A 5.1 parts by weight sample of 1',5',6',7',8',8a'-hexahydro-l-oxospiro (indan-2,2-indolizin)-3'(2H)-one in 50 parts by volume of 2-propanol is added rapidly to a suspension of 0.76 part by weight of sodium borohydride in 125 parts by volume of 2-propanol at room temperature. The mixture is stirred at reflux for two hours then cooled in an ice bath and treated with 125 parts by volume of 2.9 M hydrochloric acid. The 2-propanol is removed under reduced pressure and the mixture is extracted several times with ether-benzene solution, The combined organic solution is washed with water, dried, and evaporated under reduced pressure to 3.8 parts by weight of an oil, which partially crystallizes on standing. The aqueous acid layer is made basic with 35% sodium hydroxide solution and extracted with methylene chloride. The organic layer is washed with water, dried and evaporated under reduced pressure to an oil (0.6 part by weight). The combined oil is crystallized from benzenehexane solution to give 3.3 parts by weight of white crystals, melting point 116 C. to 128 C. One recrystallization from cyclohexane-hexane solution followed by two recrystallizations from cyclohexane gives 2.4 parts by weight of white crystals of mixed crystalline form of 1,5',6',7',8,8a'-hexahydro 1 hydroxyspiro (indan-2,2'- indolizine)-3(2'H)-one, clusters of feathery needles, melting point 137 C. to 142 C. and larger irregular prisms, melting point 151 C. to 155 C.

The mother liquor from the recrystallization of the mixture of stereoisomers is concentrated and the resulting solid is recrystallized twice from cyclohexane to give 0.200 part by weight of a single isomer as white irregular prisms, 1',5,6',7',8,8a-hexahydro 1 hydroxyspiro(indan-2,2'- indolizin)-3'(2'I-I)-one, melting point 154 C. to 156 C. A mixed melting point with the isomeric mixture is depressed.

What is claimed is:

1. Octahydro-1-p-henyl-2-indolizinemethanol fumarate. d 2. Octahydro-l-phenyl 2 indolizinemethanol methioide.

3. Octahydro-Z-benzyl 2 indolizinemethanol hydrochloride.

4. Octahydr-o-1-phenyl-2-indolizinemethyl benzilate.

5. Octahydr-o-l-phenyl-Z-(l pyrrolidinylmethyl)indolizine dihydrochloride.

6. Octahydro-l-phenyl 2 morpholinomethylindolizine dihydrochloride.

7. A compound selected from the group consisting of wherein n is a positive integer from 1 to 3 and R is a member selected from the group consisting of l-pyrrolidinyl and morpholino, and the corresponding nontoxic acid addition salts and quaternary ammonium derivatives resulting from reaction of said compound with an alkylating agent selected from the group consisting of lower alkyl halides, lower alkenyl halides, diloweralkyl sulfates and aralkylhalides.

' 9 A compound selected from the group consisting of (0 Hz) r-OH wherein n is a positive integer from 1 to 3, and the corresponding nontoxic acid addltion salts and quaternary ammonium derivatives resulting from reaction of said compound with an alkylating agent selected from the group consisting of lower alkyl halides, lower alkenyl halides, diloweralkyl sulfates and aralkylhalides.

References Cited by the Examiner UNITED STATES PATENTS 3,031,454 4/1962 Tilford 260-294.7 X 3,100,776 8/1963 Poos 260268 X OTHER REFERENCES Sternbach et al.: Jour. Am. Chem. Soc., vol. 74, pages 2219-2221 (1952).

Winterfeld et al.: Chemical Abstracts, vol. 53, page 15058 (1959).

NICHOLAS S. RIZZO, Primary Examiner. 

6. OCTAHYDRO-1-PHENYL-2-MORPHOLINOMETHYLINDOLIZINE DIHYDROCHLORIDE.
 8. A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 